Honors College Thesis

 

Examination of Dielectric Properties of BaTiO3-SrTiO3 Based Systems Public Deposited

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https://ir.library.oregonstate.edu/concern/honors_college_theses/0g354n334

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  • This thesis examines the dielectric properties of two systems based on the perovskite materials barium titanate and strontium titanate. A solid solution was created starting with these base materials and then adding varying amounts of bismuth-zinc titanate and sodium niobate. These compositions were calcined and sintered at temperatures determined to be the most phasepure by x-ray diffraction. Sintered pellets were then tested using equipment to measure their capacitance as a function of temperature and their strain as a function of applied electric field. From these results and the x-ray diffraction data the lattice parameter and dielectric constant was calculated. The system with sodium niobate had the highest capacitance and dielectric constant overall. The composition with the highest capacitance, greater than 4nf at room temperature at all tested frequencies, and dielectric constant, greater than 4000 at all tested frequencies, was 68.6 mol% barium titanate, 29.4 mol% strontium titanate, and 2 mol% sodium niobate.
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